When pumping with my Spectra I noticed that the vaulves are very loose and about to fall off when I finish pumping. I was using generic brand vaulves that I got through insurance but those wore out. I bought Spectra brand vaulves last week and they have been slipping. I have also noticed a decrease in suction. I used to get 1.5 oz sometimes 2 oz during a pump session but now I get just enough to cover the bottom of the bottle. I hand express after puming and get 1/2 oz out of each side before my hand gets to tired. Has this ever happened to anyone else? If so what was the solution?